UHF circuits

  

 

Ultra High Frequency (UHF) designates the ITU Radio frequency range of electromagnetic waves between 300 MHz and 3 GHz (3,000 MHz), also known as the decimetre band or decimetre wave as the wavelengths range from one to ten decimetres (10 cm to 1 metre).
 
Radio waves with frequencies above the UHF band fall into the SHF (super high frequency) and EHF (extremely high frequency) bands, all of which fall into the microwave frequency range. Lower frequency signals fall into the VHF (very high frequency) or lower bands. See Electromagnetic spectrum and Radio spectrum for a full listing of frequency bands.
 
The main advantage of UHF transmission is the physically short wave that is produced by the high frequency. The size of transmission and reception antennas is related to the size of the radio wave. The UHF antenna is stubby and short. Smaller and less conspicuous antennas can be used with higher frequency bands.
The major disadvantage of UHF is its limited broadcast range and reception, often called line-of-sight between the TV station's transmission antenna and customer's reception antenna, as opposed to VHF's very long broadcast range and reception, which is less restricted by line of sight.
 
The majority of digital TV stations currently broadcast their over-the-air signals in the UHF band, both because VHF had been largely already filled with analog TV at the time the digital facilities were built and because of severe issues with impulse noise on digital low-VHF channels. While virtual channel numbering schemes routinely display channel numbers like "2.1" or "6.1" for individual North American terrestrial HDTV broadcasts, these are more often than not actually UHF signals. Many equipment vendors therefore use "HDTV antenna" or similar branding as all but synonymous to "UHF antenna".
 
 

Circuits


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Electronic Circuit Diagram Tv Tuner Reciver Uhf Vhf Vl If Out 1023435. A wiring diagram is a simplified regular protraction of an electrical circuit. Subsequent we perform circuit components of Ele...

UHF FM Remote Control Receiver Circuit. The receiver is intended primarily for use with the remote control UHF transmitter described in the preceding article. It is a super-regenerative type with a...

The post explains a 330MHz UHF FM remote control transmitter circuit. ... ATTENTION HOBBYISTS: IF YOU WANT TO LEARN ELECTRONICS YOU CAN COMMENT UNDER THE ARTICLES WITH YOUR QUERIES, YOU'LL GET 100%...

Circuit Projects Nonstop-Free Electronic Circuits Project Diagram and Schematics · Home · DMCA Policy · Privacy Policy · Disclaimer · Contact Us · Home RF ... SEA-6 is a circuit amplifier bandwidt...

Circuit Projects Nonstop-Free Electronic Circuits Project Diagram and Schematics ... A very simple VHF UHF Low-Noise amplifiers circuit can be designed using the MAX2664 and MAX2665 ultra-compact L...

The circuit shown here is of a TV antenna booster based on the transistor BF180. The circuit operates in the UHF band and has a gain of 15dB. Capacitors C2,C3 C4 ,C5 and inductors L3, L4 forms a UH...


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